Could this be etching out - the landing site has side walls that appear
to be etched.  What is you etch-resist - tin plate or do you do a photo
resist cap to protect from etching?

Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lawrence Russell
Sent: Sunday, September 11, 2005 8:44 PM
To: [log in to unmask]
Subject: [TN] Microvia Puzzle

Stephen,

Could you please post this microsection on your website?
The question is what could cause this on a CO2 laser drilled, Neopact
and RPP blind via?
We are getting all sorts of opinions, from desmear problem to poor
metalization to DI water inadequate or chemical imbalances.
Any useful suggestions would be appreciated, as it has happened more
than once , but irregularly.

Larry Russell
 <<ole0.bmp>> 

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